Hand-hole scraper.



J. A. HARTWICK.

HAND HOLE SCRAPEH,

APPLICATION FILED FEB. 1S. 1916.

atented 0015.22, 1918.

JESSE A. HARTWICK, OF CHICAGO, ILLINOIS.

HAND-HOLE SCRAPER.

To all whom t may concern:

Be it known that I, JESSE A. HARTWICK, a citizen of the United States of America, resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Hand- Hole Scrapers, of which the following is a specification. Y

My invention relates to hand hole scrapers of the kind in which cutting means are rotatably mounted so that the scraper is manipulated against the inner circumferential edge of a hand hole in the boiler sheet.

rIhe cleaning of the inner circumferential edge of the hand holes in a boiler sheet is difhcult and originally was accomplished by the hand and chisel method. Scrapers as now commonly used for cleaning the hand hole edges are unsatisfactory because after the scraper is in operative position a pull and a twisting motion must be applied to the handle to cause the blades of the scraper to engage the inner edge of the hand holes. i

A further reason why this type has been unsatisfactory is because an equal pull cannot be applied to all of the blades due to the pull and twist motions that must beapplied to accomplish the cleaning of the edge of the hand hole thus bringing about an uneven surface. 'Ihe scraper of my invention overcomes this objection as I provide means which applies this pull automatically and equally on all the blades, therefore I am enabled to obtain a perfect bright and clean surface which is very essential. v

The invention further comprises the novel details of construction, parts and combination of parts hereinafter described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming a part thereof in which the same reference characters designate like parts throughout the several views and in whichl Figure 1 is an elevation of my hand ho le scraper showing it in operative position in the boiler sheet;

Fig. 2 is a plan view of Fig. 1 with parts broken away showing ratchet and pawl arrangement in handle;

Fig. 8 is a bottom view of Fig. 1;

Fig. 4 is a sectional view of the hand hole scraper showing theinternal construction; and

Fig. 5 is a fragmentary view showing the Specification of Letters Patent.

Patented Oct. 22, 1918.

Application filed February 18, 1916. Serial No. 79,027.

method of inserting the scraper in a hand hole of the boiler plate.

Referring now more in detail to my invention as illustrated and referring particularly to Figs. 1 to 5 inclusive, in which the device of my invention is used as a hand hole scraper for cleaning the inner circumferential edges of the hand hole in the boiler sheet, the device comprises a tube shaped member 1, its lower extremity terminating into an enlarged outwardly flanged portion 2. A portion of the flange 2 of the member 1 is turned down to a size to iit into a hand hole opening 4 in the boiler sheet 5. The under out shoulder 6 thus formed by the turned down portion 3 forms a bearing surface, which rests against the outer surface of the boiler sheet 5 when the device is placed in position to clean a' hand hole, as shown most clearly in Fig. 1. The member 1 has a cylindrically shaped extension 7 preferably integral with the member 1 extending downwardly and having an opening 8 I, through which operating shaft 9 extends, the said opening 8 forming a bearing for the shaft 9 when it is rotated. The shaft 9 eX- tends up through the member l for purposes as will be more' fully hereinafter described. The portion 10 of the shaft extending beyond the cupshaped extension 7 is flattened and inserted in an opening 11 formed by the two bars 12, which serves as a blade holder for the scraper blades. A helical coil spring 13 is placed around the shaft 9 in the tubeshaped member 1, one end of the said spring resting in the cylindrically-shaped extension 7 of the member 1. The shaft 9 has a collar 16 fastened to it in any suitable manner as by means of the pin 17 In assembling the device, the spring 13 is placed around the shaft 9, then the collar 16 is slipped over the shaft 9 and pinned to the said shaft by means of the pin 17 thus placing the spring 13 under tension. The upper portion 14 of the member 1 is threaded to receive a cap 15 in the form of a nut, the said cap 15 havin screw threaded engagement with the threaded portion 14 of the member 1 The cap 15 serves as a cap for the member 1 and also serves as a bearing and a stop for the collar 16 when the spring 13 is placed under tension. A crank 19 is provided for rotating the shaft 9, the said crank being loosely fastened tothe shaft 9 in any suitable manner as by means of a nut 20. A hand grip 19l is fastened to the outer extremity 21 of the arm 19 in any suitable manner as by means of the nut 22. The device is adapted to be rotated in a clockwise direction when cleaning hand holes, away from the edge of the boiler frame but when working on hand holes near the edge of the boiler frame where a full rotation of the handle is not possible, means is provided in the form of a wellknown ratchet and pawl arrangement to permit a partial turn of the crank.

The ratchet arrangement comprises a toothed wheel 23 which is suitably staked by means of a suitable pin to the shaft 9. The Wheel 23 sets in a recess 2st in the handle 19 in position tobe engaged by a pawl 25 which is pivotally mounted in the recess 211 by means of the pivot pin 26. rlhe pawl 25 is held in engagement with the ratchet wheel 23 by means of a spring 2T. A suitable cover plate 28 is pinned to the handle 19 and forms a covering for the recess containing the ratchet and pawl mechanism, and also forms a bearing surface for the nut 20. The portion 91 of the shaft 9 extends slightly beyond the cover 28 forming a shoulder against which the nut 2O rests thus holding the handle 19 loosely upon the shaft 9. When the member 19 is rotated in a clockwise direction pawl 25 is held in engagement with the ratchet 23. N ow when only a limited movement of the handle is possible, the return movement of the handle is allowed in a counterclockwise directioni without rotating the shaft 9, due to the pawl 25 riding over the teeth of the ratchet wheel 23, thus allowing a full rotation of the scraper S even though the handle 19 can be rotated only part way. The scraper S as before mentioned, is constructed of two bars 12 to form a blade holder for the scraper blades 30 and 31, the said blades being held in the blade holder by means of bolts 36, f37 provided with nuts 38, 39. The blade holder is pivotally attached to shaft 9 by Vmeans of a bolt 32 and nut 33.

To insert ,the attached scraper S into a hand hole 4 of the boiler sheet 5, a down ward pressure is applied upon the handle 19 against the normal tension ofthe spring 13 and the scraper S is then tilted and inserted into the hand hole 1l as illustrated in F ig. 5, until the flanged portion 6 of the member 1 rests against the outer face of the boiler plate and the annular portion 3 fits into the said hand hole. The pressure is then released from the handle 19 and the spring 13 tends to restore the shaft 9 to normal drawing the scraper blades 30, 31 of the scraper member S against the inner circumferential edge of thehand hole 4. The operating mechanism B is thus held in 'place in the hand hole l by the spring tensionof coil spring 13. The turning of the handle 19 in a clockwise direction changes `inner circumferential edge of the boiler sheet and that pressure, due to the spring 13 being under tension, is automatically applied and is equally distributed so that the blades all engage the plate with the same amount of pressure. Now, only a rotary motion of the mechanism is necessary to clean the hand holes. 1t is thus seen that a great amount of labor is saved, as well as a great amount ot time in using the device of my invention over the prior devices that required both a pulling and a twisting motion, and the hand holes can be cleaned better and a truer surface obtained. To remove the scraper pressure is again applied to the handle 19, the scraper is then tilted as before and withdrawn from the hand hole.

`While l have .described my invention operating in connection with a certain form of opening, 1 do not wish to be limited to this exact disclosure and construction of parts as many changesl and modilicati'on's may be made which' will readily suggest themselves but I Vaim to cover all such and `modiications which come within the spirit and scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. A device of the character described including a cylindrical member having an enlarged outwardly flanged bottom portion, an integrally formed cylindrical tube extending down into said lianged bottom portion, a shaft extending through said cylindrical tube, a collar secured to said shaft, a helical spring contained within said cylindrical member surrounding said shaft and having its one end bearing against the bot tom portion of said cylindrical tube and its other end bearing against said collar, a plurality of cleaning members secured to said shaft, a handle for rotating said shaft, and ratchet and pawl mechanism connecting said handle to said' shaft.

A device of the character described including a cylindrical member having an enlarged outwardly flanged bottom portion, an integrally, formed cylindrical tube ei;a tending down into said anged bottom portion, a shaft extending through said cylindrical tube, a collar secured to saidshaft, a helical spring contained within said cylindrical member surrounding said shaft and having its one end' bearing against the bottom portion of said cylindrical tube and its other end bearing against said collar, and

a plurality of cleaning blades connected to said shaft.

3. A device of the character described including a cylindrical member having an enlarged outwardly flanged bottom portion, an integrally formed cylindrical tube eX- tending down into said flanged bottom portion, a shaft extending through said cylindrical tube, a collar secured to said shaft, a helical spring contained Within said cylindrical member surrounding said shaft and having its one end bearing against the bottom portion of said cylindrical tube and its other end bearing against said collar, a blade carrying member pivotally secured to said shaft, a plurality of blades removably held by said blade carrying member, and means for rotating Said shaft.

4. A device of the character described including a tubular supporting member provided with an integrally formed outwardly flanged portion, a cylindrical orifice extending the length of said supporting member, a rotary shaft extending through said orifice, a helical spring contained Within said orifice and surrounding said shaft having its one end bearing against one end of said supporting member and its other end bear ing against a collar secured to said shaft, a member secured to said supporting member against which Said collar bears, a plurality of cleaning blades secured to said shaft, and means forrotating said shaft to cause said blades to operate on said plate.

Signed by me at Chicago, county of Cook and State of Illinois in the presence of two Witnesses.

JESSE A. HARTWICK.

Witnesses:

WM. BERGHAHN, GEO. A. YANOCHOWSKI.

Copies of this patent may be obtained for tive cents each, by addressing the "Commissioner of Patente,

Washington, D. C. 

